Never heard anything unusual or good from motor cop pipes, here and there. But, in Nashville this week and downtown at the Titan's game & on music row there were lots of motorcops and they have the bestsweetestrumble pipes I've heard. Mellow idle but when moving sounds like a 50's Peterbilt tearing up a mtn. road. I've got to get one of them cornered while here and find out what those pipes are!!

 

I'm not an expert but I beleive their bikes have a different engine and transmission setup than stock bikes do. Many other factors to check out ...